Comparison of hydration properties between cement-GGBS-fly ash blended binder and cement-GGBS-steel slag blended binder

The hydration properties of cement-GGBS-fly ash blended binder and cement-GGBS-steel slag blended binder were compared. The experimental results show that the hydration rate of cement-GGBS- steel slag blended binder is higher than that of cement-GGBS-fly ash blended binder within 28 days, but lower than the latter after 28 days. The hydration of cement-GGBS-steel slag blended binder tends to produce more Ca（OH）2 than the hydration of cement-GGBS-fly ash blended binder, especially at late ages. Cement-GGBS- steel slag mortar exhibits higher strength than cement-GGBS-fly ash mortar within 28 days, but at late ages, it exhibits similar compressive strength with eement-GGBS-fly ash mortar and even slightly lower bending strength than cement-GGBS-fly ash mortar. Cement-GGBS-steel slag paste has finer early pore structure but coarser late pore structure than cement-GGBS-fly ash paste. Cement-GGBS-steel slag paste can get satisfied late pore structure and cement-GGBS-steel slag mortar can get satisfied late strength as compared with pure cement paste and pure cement mortar, respectively.     

Synthesis of calcium silicate hydrate based on steel slag with various alkalinities

This study aimed to improve the hydraulic potential properties of the slag. Therefore, a method of dynamic hydrothermal synthesis was applied to synthesize calcium silicate hydrate. The phases and nanostructures were characterized by XRD, FTIR, TEM, and BET nitrogen adsorption. The infl uence of alkalinity of steel slag on its structures and properties was discussed. The experimental results show that, the main product is amorphous calcium silicate hydrate gel with fl occulent or fi brous pattern with a BET specifi c surface area up to 77 m2/g and pore volume of 0.34 mL/g. Compared with low alkalinity steel slag, calcium silicate hydrate synthesized from higher alkalinity steel slag is prone to transform to tobermorite structure.     

抱罐车优化创新设计与应用

针对抱罐车在制造、使用过程中易出现的各种问题,提出相对应的优化设计方法,并予以应用。证明经过创新优化设计后的抱罐车相应性能有了显著提高,指出模块化、智能化、节能、环保、远程监控等将是抱罐车的发展趋势。     

改性钢渣除藻效果研究

对改性钢渣在机械搅拌条件下的除藻效果进行了研究,并分析了改性钢渣预处理与混凝联用工艺对藻类的去除效果和协同作用.实验表明,钢渣经改性后,既能有效地去除水中的藻类,又能降低藻的光合活性,抑制藻的生长;高温活化改性钢渣预处理与混凝联用工艺对藻类有很好的去除效果,其对叶绿素a的平均去除率达91.4％,远高于单纯的钢渣预处理和混凝工艺.这暗示了两者之间在除藻方面存在协同作用.     

钢渣粉磨工艺的应用研究

许多钢渣粉磨工艺系统在遇到前处理阶段熔融态钢渣的热泼工艺（或水淬工艺）等预处理方式变化、干基产量变化、矿量波动系数变化、物料易磨性指数变化、来料水分变化等的情况下,经常会遇到研磨设备功率不匹配、产品粒度不达标、单产电耗不达标和粉磨工艺系统不稳定的情况。本文分别对山西某公司年产30 万t钢渣“辊压机＋球磨机”微粉生产线和福建某公司年产30 万t钢渣立磨微粉生产线进行了现场调研,并对粉磨设备的单产电耗、产品粒度分布 曲线和产品颗粒形状等进行了对比分析。     

Nb_2O_5-MnO-SiO_2渣中Nb_2O_5和MnO活度的研究SCIEI

本文利用含NbFe液与Nb_2O_5-MnO-SiO_2渣之间平衡,在1828K温度下应用固体电解质浓差电池方法测定了Fe液中氧的活度,从而计算出渣中Nb_2O_5及MnO的活度,并绘制了Nb_2O_5-MnO-SiO_2三元系的等α_(Nb_2O_5)和等α_(MnO)图。     

水口结瘤对板坯连铸结晶器钢水行为影响的数值模拟

以230 mm×1 600 mm板坯连铸机结晶器为研究对象,采用CFD数值模拟的计算方法,建立了VOF模型,研究了连铸水口结瘤对钢渣界面波动与钢液流动行为的影响。研究结果表明,当水口无结瘤时,结晶器内流场为典型的双环流形貌。当水口有结瘤时,结晶器内水口两侧会出现严重的非对称流,结瘤侧流股范围小,非结瘤侧流股范围大。水口不结瘤一侧动能增大导致结晶器下涡心位置下降,会使钢液冲击深度增大;水口结瘤一侧水口因涡心位置较高,加剧了弯月面处的波动和钢渣表面的波动紊乱。结瘤情况下的钢液波动较大,最大波动差为4.03 mm;不结瘤情况下钢液波动较平稳,最大波动差为1.4 mm。     

钢包钢渣清拆机无线遥控系统

为了提高工作效率、减轻劳动强度,设计了马钢固定式钢包钢渣清拆机无线遥控系统.无线遥控控制系统主要由无线控制器、无线接收器和PLC组成.控制器将按钮信号编码经调制后转换成电磁波信号发出,接收器将接收的电磁波信号滤波放大,经解码识别传送给PLC实现对被控目标的控制.采用远程遥控控制后,消除了以往由于视线不清、环境恶劣等因素造成的事故隐患,提高了工作效率,减轻了劳动强度.该文详细说明了系统的设计思路及设计方法.     

钢渣沥青混凝土技术及其应用研究进展

钢渣常被当成工业废弃物处置,但其碱性强、棱角丰富,兼具有优异的力学特性,可以改善沥青混凝土的抗水损害、抗高温变形以及耐磨和抗滑等性能,被认为是可替代天然矿质集料的理想筑路材料。近年来道路建设对集料用量的高需求与天然集料短缺之间的矛盾越来越突出,钢渣沥青混凝土技术因而成为备受关注的热点。概述了钢渣的材料特性以及钢渣沥青混凝土的设计与性能,介绍了钢渣沥青混凝土的实际应用情况,研究了钢渣沥青混凝土长期应用后的路面性能变化,最后对钢渣沥青混凝土未来的发展趋势进行了展望。     

浅析某油料码头防洪墙建设难点与对策

介绍了某油料码头防洪墙在建设过程中,由于遇特殊地质条件而采取的相应处理措施,并以该码头建设为基础,归纳总结了一些在油罐区进行类似防洪墙工程建设的有关设计和管理方面的经验。